Use our Roof Kit Calculator to find the right EPDM membrane for your flat roof — simply enter your roof dimensions and we'll identify the correct membrane width and length from our stock range. Our EPDM membranes are supplied in standard roll widths up to 15.25 metres, with no joins required on the vast majority of domestic roof sizes, giving you a completely seamless waterproof covering in a single piece.

Available in 1.0mm, 1.2mm, and 1.5mm thickness options, our BBA-certified EPDM membranes are priced per linear metre and cut to your exact specification. The calculator helps you identify which standard width covers your roof without excess waste — saving money and simplifying the installation. For roofs wider than our standard membrane widths, our team can advise on seaming techniques or alternative layouts to ensure a fully watertight result.

Not sure which thickness to choose? As a guide: 1.2mm is suitable for sheds, outbuildings, and garden rooms with no foot traffic. 1.5mm is recommended for garages, extensions, and any roof where occasional foot access is needed for maintenance. 1.0mm is available for specialist applications and re-roofing over existing membranes. All thicknesses carry the same 50+ year manufacturer guarantee and BBA certification.

For a complete, all-inclusive installation, browse our EPDM roof kits — which include the membrane plus all adhesives, primers, trims, and fixings needed for your specific roof type. Call our technical team on 02031510153 for free advice on selecting the right membrane or kit for your project. Free UK delivery on all orders.